Wide-band large target surface infrared imaging lens covering short wave and medium wave bands

By designing a wide-band, large-target infrared imaging lens covering short-wave and mid-wave bands, and employing specific materials and aspherical and diffractive surface technologies, the problem of existing lenses being unable to match large-target, high-resolution infrared detectors has been solved, achieving efficient imaging and high resolution in the 1.5-5.5µm band.

CN122239263APending Publication Date: 2026-06-19NANJING WAVELENGTH OPTO ELECTRONICS SCI & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING WAVELENGTH OPTO ELECTRONICS SCI & TECH CO LTD
Filing Date
2026-03-10
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing infrared imaging lenses are generally designed for a single wavelength, making it difficult to match with large-area, high-resolution infrared detectors. This presents significant design challenges, particularly in chromatic aberration correction and material selection.

Method used

A wide-band, large-surface infrared imaging lens covering short-wave and mid-wave bands was designed. It employs specific materials and aspherical and diffractive surface technologies. Through the combination of zinc sulfide, chalcogenide glass, zinc selenide, and calcium fluoride, chromatic aberration is corrected and aberrations are improved. It is suitable for infrared detectors in the 1.5-5.5µm band.

Benefits of technology

It achieves high-resolution imaging in the 1.5-5.5µm band, suitable for 1280x1024 pixel infrared detectors, with a focal length of 300mm. The aperture stop is located at the cold screen of the detector, with 100% cold screen utilization. It provides clear imaging, high resolution, large optical light transmission, and a compact structure.

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Abstract

This invention discloses a wide-band, large-area infrared imaging lens covering short-wave and mid-wave bands, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object plane to the image plane; the first lens is a biconvex lens with positive refractive power; the second lens is a biconcave lens with negative refractive power; the third lens is a plano-concave lens with negative refractive power; the fourth lens is a convex-concave lens with positive refractive power; the fifth lens is a convex-concave lens with negative refractive power; the sixth lens is a biconvex lens with positive refractive power; and the seventh lens is a convex-plano lens with positive refractive power. This wide-band, large-area infrared imaging lens covering short-wave and mid-wave bands is suitable for the 1.5-5.5µm band, can be matched with high-resolution 1280x1024 (10µm) infrared detectors, has high optical throughput, can be used for imaging objects at greater distances, and has a compact structure.
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